CN109371742B - Cup packing paper and preparation method thereof - Google Patents
Cup packing paper and preparation method thereof Download PDFInfo
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- CN109371742B CN109371742B CN201811301880.0A CN201811301880A CN109371742B CN 109371742 B CN109371742 B CN 109371742B CN 201811301880 A CN201811301880 A CN 201811301880A CN 109371742 B CN109371742 B CN 109371742B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
- D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/50—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with organometallic compounds; with organic compounds containing boron, silicon, selenium or tellurium atoms
- D06M13/51—Compounds with at least one carbon-metal or carbon-boron, carbon-silicon, carbon-selenium, or carbon-tellurium bond
- D06M13/513—Compounds with at least one carbon-metal or carbon-boron, carbon-silicon, carbon-selenium, or carbon-tellurium bond with at least one carbon-silicon bond
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/14—Polyalkenes, e.g. polystyrene polyethylene
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/47—Condensation polymers of aldehydes or ketones
- D21H17/49—Condensation polymers of aldehydes or ketones with compounds containing hydrogen bound to nitrogen
- D21H17/50—Acyclic compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/18—Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/20—Polyalkenes, polymers or copolymers of compounds with alkenyl groups bonded to aromatic groups
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Paper (AREA)
Abstract
The invention relates to paper, in particular to cup packing paper and a preparation method thereof. The invention is mainly prepared from the following components in parts by weight: 20-30 parts of softwood pulp fibers, 20-30 parts of bamboo fibers, 30-50 parts of polyethylene particles, 0.05-0.5 part of graphene and 5-10 parts of acrylic latex, wherein the polyethylene particles and the graphene are subjected to melt blending and spinning and are modified to obtain polyethylene/graphene composite fibers with better hydrophilic dispersibility and carbon dioxide adsorption, then the polyethylene/graphene composite fibers are combined with the softwood pulp fibers and the bamboo fibers to form base paper, and the base paper is subjected to carbon dioxide foaming to form fine cells in the polyethylene/graphene composite fibers, so that the heat insulation performance of the prepared paper is greatly improved, the weight of the paper is effectively reduced, and the materials are saved.
Description
Technical Field
The invention relates to paper, in particular to cup packing paper and a preparation method thereof.
Background
The cup mat has become an essential daily use in daily life, for safety and practicability, the cup mat needs to be light and durable, and has excellent heat insulation performance, in the prior art, in order to meet the above requirements, the materials for manufacturing the cup mat are also divided into several categories, such as a wooden cup mat, a metal cup mat, a plastic cup mat, a paper cup mat and the like, however, some cup mats are complicated in preparation method, and some cup mats do not save the environment, especially the paper cup mats, because common paper does not have heat insulation performance, and the strength is not high, and the cup mats are fragile when meeting water, so the paper cup mats are usually disposable, and the heat insulation effect is also poor.
For example, a "cup mat base paper and a production method thereof" disclosed in chinese patent literature, and publication No. CN104018388B thereof, discloses a cup mat base paper and a production method thereof. The raw material pulp of each layer is two kinds of paper pulp raw materials of softwood pulp, hardwood pulp and mechanical pulp, and a starch layer formed in a spraying mode is arranged between layers to improve the bonding strength between the layers; the softwood pulp is bleached sulfate softwood pulp, the hardwood pulp is bleached sulfate hardwood pulp, and the mechanical pulp is chemically bleached thermomechanical pulp. The base paper of the cup mat is divided into a surface layer, a core layer and a bottom layer, the preparation method is complex, and the base paper does not have high heat-insulating property.
Disclosure of Invention
In order to overcome the problems, the invention prepares the paper cup mat with good heat insulation effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
the cup liner paper is prepared from the following components in parts by weight: 20-30 parts of softwood pulp fibers, 20-30 parts of bamboo fibers, 30-50 parts of polyethylene particles, 0.05-0.5 part of graphene and 5-10 parts of acrylic latex.
The preparation method of the cup packing paper comprises the following steps:
(1) placing the polyethylene particles in a vacuum oven for vacuum drying, then, carrying out melt mixing with graphene at the temperature of 140-;
(2) soaking the polyethylene/graphene composite fiber material in 5-15 wt% ammonium sulfate solution as an anode, introducing 1-2A/g current into a carbon rod as a cathode, treating at 50-75 ℃ for 5-10min, then washing with deionized water, and drying to obtain an oxidized polyethylene/graphene composite fiber material;
(3) dispersing the polyethylene/graphene composite fiber subjected to oxidation treatment in an ethanol solution, adding 3-aminopropyltriethoxysilane, refluxing for 12-18h at 75-90 ℃, and then washing the polyethylene/graphene composite fiber by using absolute ethanol to obtain 3-aminopropyltriethoxysilane modified polyethylene/graphene composite fiber;
(4) soaking softwood pulp fibers, bamboo fibers and 3-aminopropyltriethoxysilane modified polyethylene/graphene composite fibers in water at the temperature of 80-95 ℃ for 10-15h, then putting the soaked composite fibers into a pulping machine for pulping, wherein the pulping pressure is 3-5N/mm, and then putting the pulper for pulping;
(5) adding acrylic latex into the slurry obtained in the step (4), and uniformly mixing to obtain mixed slurry;
(6) putting the mixed slurry into a paper machine, and carrying out papermaking, squeezing and drying to obtain base paper;
(7) placing the base paper in a carbon dioxide environment, and adsorbing for 10-15h at 20-40 ℃ under the condition of 10-15 MPa;
(8) and foaming the base paper absorbed by the carbon dioxide, naturally cooling, and cutting to obtain the cup packing paper.
The invention mainly takes wood pulp fiber, bamboo fiber and polyethylene/graphene composite fiber as main raw materials to be made into base paper together, and the inventor discovers that because the pure polyethylene fiber has no hydrophilic group on the chain segment, the pure polyethylene fiber has poor hydrophilicity, so the dispersibility of the pure polyethylene fiber in softwood pulp fiber and bamboo fiber is poor during pulping, therefore, the invention firstly uses polyethylene particles as the raw materials to be melted and mixed with a certain amount of graphene for spinning to obtain the polyethylene/graphene composite fiber, the polyethylene/graphene composite fiber mixed with the graphene has two advantages, firstly, the composite fiber can be soaked in electrolyte ammonium sulfate solution as an anode, then uses a carbon rod as a cathode, after current is introduced, the graphene on the surface of the polyethylene can adsorb oxygen-containing groups, secondly, the graphene mixing of the graphene is beneficial to the foaming of later-stage fibers, the reason is that in the carbon dioxide adsorption process before foaming, the graphene is mixed to increase the adsorption of carbon dioxide, and the graphene can also be used as a heterogeneous nucleation point during foaming to facilitate the formation of foam pores, and then when the polyethylene/graphene composite fiber is subjected to electrochemical oxidation treatment, the ammonium sulfate solution is used as an electrolyte, because the ammonium sulfate solution is a neutral electrolyte, if the electrolyte is acidic, the polyethylene/graphene composite fiber is corroded, and if the electrolyte is alkaline, the ammonium sulfate solution reacts with oxygen-containing groups adsorbed on the surface of the polyethylene/graphene composite fiber to reduce the oxidation degree, and the current density has a large influence on the adsorption amount of the oxygen-containing groups, and when the current density is less than 1A/g during electrification, the electrochemical reaction on the surface of the polyethylene/graphene composite fiber is too slow, the amount of adsorption is small, and when the current density is less than 2A/g, the reaction is too vigorous to control the degree of oxidation. And then, the polyethylene/graphene composite fiber is modified by 3-aminopropyltriethoxysilane, so that the dispersibility of the polyethylene/graphene composite fiber during papermaking can be improved, and the amino group grafted on the polyethylene/graphene composite fiber can increase the carbon dioxide adsorption of the polyethylene/graphene composite fiber, thereby being beneficial to the subsequent foaming process. After the polyethylene/graphene composite fibers, the wood pulp fibers and the bamboo fibers are mixed and pulped, the acrylic latex is added, the retention force of the fibers can be improved, and the acrylic latex has certain binding force and is adsorbed to the surfaces of the fibers to form aggregates after the bonding force among the fibers is increased, so that the fibers are mutually bonded, and the tensile index of the paper is effectively improved. And (2) after the mixed pulp is made, squeezed and dried to obtain base paper, putting the base paper into a carbon dioxide environment, so that the polyethylene/graphene composite fiber with amino groups on the surface is subjected to carbon dioxide adsorption, then foaming is carried out, tiny foam holes can be generated inside the polyethylene/graphene composite fiber, the heat insulation performance of the cup liner paper is greatly improved, and finally, the cup liner paper in the required shape is obtained after cooling and cutting.
Preferably, the mass fraction of graphene in the polyethylene/graphene composite fiber material in the step (1) is 1% o to 2%.
Preferably, the 3-aminopropyltriethoxysilane accounts for 2% -5% of the mass of the ethanol in the step (3).
Preferably, the mass ratio of the softwood pulp fibers, the bamboo fibers and the 3-aminopropyltriethoxysilane-modified polyethylene/graphene composite fibers in the step (4) is 1:0.8-1.2: 1-2.
The heat insulation property of the base paper can be obviously improved after the polyethylene/graphene composite fibers are foamed, but the polyethylene/graphene composite fibers are too much or the production cost of the base paper is increased, so that the heat insulation property of the base paper of the polyethylene/graphene composite fibers in the raw material formula can meet the required requirement under the quality ratio, the production cost is low, and the commercial benefit is maximized.
Preferably, the rotation speed of the beater in the step (4) is 20-30HZ, and the solid content of the pulp is 2-4 wt%.
When the raw paper is pulped under the condition, the polyethylene/graphene composite fiber can be well dispersed in the pulp, and the prepared raw paper has good performance.
Preferably, the mass of the added acrylic latex in the step (5) is 6 to 10% relative to the solid content of the slurry.
If the mass of the acrylic latex is too low, the acrylic latex is not adsorbed onto the fibers in sufficient quantity, the bonding force between the fibers is insufficient, the tensile index of the base paper cannot meet the requirement, the bonding force between the fibers is increased along with the increase of acrylic acid, and the tensile index is increased along with the increase of the bonding force, but when the mass of the acrylic latex is too high, the acrylic latex is adhered to the surface of the fibers to generate flocculation, so that the dispersion of the fibers is greatly hindered, and the tensile index is reduced, therefore, the mass range of the required acrylic latex is determined through repeated experimental verification of the inventor.
Preferably, the acrylic latex has a solids content of 35 to 45%.
Preferably, the foaming condition in the step (8) is that the hot-pressing foaming is carried out at 70-90 ℃ and 1-3 MPa.
The base paper is firstly adsorbed by carbon dioxide at a low temperature of 20-40 ℃, and then at a higher temperature of 70-90 ℃, the adsorbed carbon dioxide can escape to generate foam holes, and pressure of 1-3MPa is given during foaming, because the base paper can expand during foaming, certain pressure is needed to ensure the smoothness of paper, but the pressure cannot be too large or too small during foaming, when the pressure is too small, the smoothness of the paper surface cannot be ensured, and when the pressure is too large, the foam holes can be flattened due to bearing the too large pressure, so that the foam holes cannot be formed.
Therefore, the invention has the following beneficial effects: the polyethylene particles and graphene are subjected to melt blending and spinning, and are modified to obtain polyethylene/graphene composite fibers with better hydrophilic dispersibility and carbon dioxide adsorption, then the polyethylene/graphene composite fibers are combined with softwood pulp fibers and bamboo fibers to make paper, so that base paper is obtained, and the base paper is subjected to carbon dioxide foaming, so that fine cells are formed in the polyethylene/graphene composite fibers, the heat insulation performance of the prepared paper is greatly improved, the weight of the paper is effectively reduced, and the materials are saved.
Detailed Description
The present invention will be described more clearly and completely with reference to the following specific embodiments, which are obviously only a part of the embodiments of the present invention, but not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
Example 1: the preparation method of the cup packing paper comprises the following steps:
(1) placing 100g of polyethylene particles in a vacuum oven for vacuum drying, then, carrying out melt mixing with 0.5g of graphene at 150 ℃, and spinning to obtain polyethylene/graphene composite fibers;
(2) soaking the polyethylene/graphene composite fiber in 5wt% ammonium sulfate solution as an anode, introducing 1A/g current with a carbon rod as a cathode, treating at 50 ℃ for 7.5min, then washing with deionized water, and drying to obtain oxidized polyethylene/graphene composite fiber;
(3) dispersing 50g of oxidized polyethylene/graphene composite fiber into 200ml of ethanol solution, adding 4.2g of 3-aminopropyltriethoxysilane, refluxing for 13h at 80 ℃, and then washing the polyethylene/graphene composite fiber for 3 times by using absolute ethyl alcohol to obtain 3-aminopropyltriethoxysilane modified polyethylene/graphene composite fiber;
(4) putting 25g of softwood pulp fiber, 25g of bamboo fiber and 40g of 3-aminopropyltriethoxysilane modified polyethylene/graphene composite fiber into 2kg of water, soaking at 80 ℃ for 11h, then putting into a pulping machine for pulping, wherein the pulping pressure is 3.5N/mm, and after 10min of pulping, putting into a pulping machine for pulping, and the rotation speed of the pulping machine is 21 HZ;
(5) adding 6.3g of acrylic latex with the solid content of 37wt% into the slurry obtained in the step (4), and uniformly mixing to obtain mixed slurry;
(6) putting the mixed slurry into a paper machine, and carrying out papermaking, squeezing and drying to obtain base paper;
(7) placing the base paper in a carbon dioxide environment, and adsorbing for 10 hours at 23 ℃ under 11 MPa;
(8) foaming the base paper absorbed by carbon dioxide at 72 ℃ under 1.3MPa, naturally cooling, and cutting to obtain the cup packing paper.
Example 2: the preparation method of the cup packing paper comprises the following steps:
(1) placing 100g of polyethylene particles in a vacuum oven for vacuum drying, then, carrying out melt mixing with 0.3g of graphene at 190 ℃, and spinning to obtain polyethylene/graphene composite fibers;
(2) soaking the polyethylene/carbon fiber composite fiber in 12wt% ammonium sulfate solution as an anode, introducing 1.6A/g current with a carbon rod as a cathode, treating at 55 ℃ for 5min, then washing with deionized water, and drying to obtain oxidized polyethylene/graphene composite fiber;
(3) dispersing 50g of oxidized polyethylene/graphene composite fiber into 200ml of ethanol solution, adding 5.8g of 3-aminopropyltriethoxysilane, refluxing for 15h at 82 ℃, and then washing the polyethylene/graphene composite fiber for 3 times by using absolute ethanol to obtain 3-aminopropyltriethoxysilane modified polyethylene/graphene composite fiber;
(4) putting 23g of softwood pulp fiber, 22g of bamboo fiber and 45g of 3-aminopropyltriethoxysilane modified polyethylene/graphene composite fiber into 2.3kg of water, soaking at 93 ℃ for 12h, then putting into a pulping machine for pulping, wherein the pulping pressure is 4N/mm, pulping for 15min, putting into a pulping machine for pulping, and the rotation speed of the pulping machine is 23 HZ;
(5) adding 7.8g of acrylic latex with the solid content of 41wt% into the slurry obtained in the step (4), and uniformly mixing to obtain mixed slurry;
(6) putting the mixed slurry into a paper machine, and carrying out papermaking, squeezing and drying to obtain base paper;
(7) placing the base paper in a carbon dioxide environment, and adsorbing for 12h at 30 ℃ under 12 MPa;
(8) foaming the base paper absorbed by carbon dioxide at 83 ℃ under 1.8MPa, naturally cooling, and cutting to obtain the cup packing paper.
Example 3: the preparation method of the cup packing paper comprises the following steps:
(1) placing 100g of polyethylene particles in a vacuum oven for vacuum drying, then, carrying out melt mixing with 0.8g of graphene at 180 ℃, and spinning to obtain polyethylene/graphene composite fibers;
(2) soaking the polyethylene/carbon fiber composite fiber in a 14wt% ammonium sulfate solution as an anode, introducing a current of 2A/g by using a carbon rod as a cathode, treating at 75 ℃ for 9min, then washing with deionized water, and drying to obtain oxidized polyethylene/graphene composite fiber;
(3) dispersing 50g of oxidized polyethylene/graphene composite fiber into 200ml of ethanol solution, adding 8.7g of 3-aminopropyltriethoxysilane, refluxing for 18h at 90 ℃, and then washing the polyethylene/graphene composite fiber for 3 times by using absolute ethanol to obtain 3-aminopropyltriethoxysilane modified polyethylene/graphene composite fiber;
(4) 20g of softwood pulp fiber, 18g of bamboo fiber and 39g of 3-aminopropyltriethoxysilane modified polyethylene/graphene composite fiber are put into 2.5kg of water, soaked for 14h at 95 ℃, then put into a pulping machine for pulping, the pulping pressure is 4.5N/mm, the pulping is carried out for 20min, and then the pulping machine is put into a pulping machine for pulping, and the rotating speed of the pulping machine is 28 HZ;
(5) adding 9.1g of acrylic latex with the solid content of 45wt% into the slurry obtained in the step (4), and uniformly mixing to obtain mixed slurry;
(6) putting the mixed slurry into a paper machine, and carrying out papermaking, squeezing and drying to obtain base paper;
(7) placing the base paper in a carbon dioxide environment, and adsorbing for 15h at 35 ℃ and 14.3 MPa;
(8) foaming the base paper absorbed by carbon dioxide at 90 ℃ under 2.8MPa, naturally cooling, and cutting to obtain the cup packing paper.
Comparative example 1: the difference from example 1 is that after the mixed slurry was put into a paper machine, and subjected to papermaking, pressing and drying, a base paper was obtained, and then, without carbon dioxide foaming, a cup liner was obtained by cutting.
Subsequently, the thermal conductivity was measured by the hot plate method for the different examples and comparative example 1, and the measured data are as follows.
| Coefficient of thermal conductivity (W/mk) | |
| Example 1 | 0.048 |
| Example 2 | 0.052 |
| Example 3 | 0.041 |
| Comparative example 1 | 0.15 |
As can be seen from the data in the above table, compared to the comparative example without foaming in comparative example 1, the thermal conductivity of the paper after foaming in example 1 is significantly reduced, indicating that the thermal insulation performance is significantly improved.
Comparative example 2: the difference from example 1 is that the current density of the polyethylene/graphene composite fiber subjected to the oxidation treatment was 0.3A/g.
Comparative example 3: the difference from example 1 is that the current density of the polyethylene/graphene composite fiber subjected to the oxidation treatment was 1.5A/g.
The current density during oxidation treatment was different, and the hydrophilicity of the polyethylene/graphene composite fiber was different, which had a large effect on the tensile index of the cup liner, and the results are shown in the following table.
| Tensile index (Nm/g) | |
| Example 1 | 20.3 |
| Comparative example 2 | 14.5 |
| Comparative example 3 | 15.3 |
As can be seen from the data in the above table, the tensile index of the paper is reduced when the current density is too high or too low.
Comparative example 4: the difference from example 1 is that the pressure for foaming in step (8) is 0.5 MPa.
Comparative example 5: the difference from example 1 is that the pressure for foaming in step (8) is 5 MPa.
The foaming pressure affects the foaming degree and flatness of the paper cup liner, and the heat insulation property of the paper cup liner is affected, and the heat conductivity coefficient is measured by using a hot plate method, and the measured data are as follows.
| Coefficient of thermal conductivity (W/mk) | Flatness of the steel sheet | |
| Example 1 | 0.048 | Leveling |
| Comparative example 4 | 0.53 | Unevenness of the skin |
| Comparative example 5 | 0.94 | Leveling |
As can be seen from the data in the above table, the smoothness of the paper cup liner is poor when the pressure is too low, but the heat insulation performance of the paper cup liner is reduced when the pressure is too high.
Claims (8)
1. The preparation method of the cup packing paper is characterized by comprising the following steps of:
(1) placing the polyethylene particles in a vacuum oven for vacuum drying, then, carrying out melt mixing with graphene at the temperature of 140-;
(2) soaking the polyethylene/graphene composite fiber material in 5-15 wt% ammonium sulfate solution as an anode, introducing 1-2A/g current into a carbon rod as a cathode, treating at 50-75 ℃ for 5-10min, then washing with deionized water, and drying to obtain an oxidized polyethylene/graphene composite fiber material;
(3) dispersing the polyethylene/graphene composite fiber subjected to oxidation treatment in an ethanol solution, adding 3-aminopropyltriethoxysilane, refluxing for 12-18h at 75-90 ℃, and then washing the polyethylene/graphene composite fiber by using absolute ethanol to obtain 3-aminopropyltriethoxysilane modified polyethylene/graphene composite fiber;
(4) soaking softwood pulp fibers, bamboo fibers and 3-aminopropyltriethoxysilane modified polyethylene/graphene composite fibers in water at the temperature of 80-95 ℃ for 10-15h, then putting the soaked composite fibers into a pulping machine for pulping, wherein the pulping pressure is 3-5N/mm, and then putting the pulper for pulping;
(5) adding acrylic latex into the slurry obtained in the step (4), and uniformly mixing to obtain mixed slurry;
(6) putting the mixed slurry into a paper machine, and carrying out papermaking, squeezing and drying to obtain base paper;
(7) placing the base paper in a carbon dioxide environment, and adsorbing for 10-15h at 20-40 ℃ under the condition of 10-15 MPa;
(8) foaming the base paper adsorbed by the carbon dioxide, naturally cooling and cutting to obtain the cup packing paper.
2. The preparation method of the cup packing paper according to claim 1, wherein the mass fraction of graphene in the polyethylene/graphene composite fiber material in the step (1) is 1% o to 2%.
3. The method for preparing cup packing paper according to claim 1, wherein the 3-aminopropyltriethoxysilane accounts for 2% -5% by mass of the ethanol solution in the step (3).
4. The preparation method of the cup packing paper according to claim 1, wherein the mass ratio of the softwood pulp fibers, the bamboo fibers and the 3-aminopropyltriethoxysilane-modified polyethylene/graphene composite fibers in the step (4) is 1:0.8-1.2: 1-1.4.
5. The method for preparing the cup packing paper according to claim 1, wherein the rotation speed of the beater in the step (4) is 20-30Hz, and the solid content of the pulp is 2-4 wt%.
6. The method for producing a cup packing paper according to claim 1, wherein the mass of the added acrylic latex in the step (5) is 6% to 10% with respect to the solid content of the slurry.
7. The method for preparing a cup liner according to claim 6, wherein the acrylic latex has a solid content of 35wt% to 45 wt%.
8. The method for preparing cup packing paper according to claim 1, wherein the foaming in the step (8) is performed by hot-pressing foaming at 70-90 ℃ under 1-3 MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811301880.0A CN109371742B (en) | 2018-11-02 | 2018-11-02 | Cup packing paper and preparation method thereof |
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| CN201811301880.0A CN109371742B (en) | 2018-11-02 | 2018-11-02 | Cup packing paper and preparation method thereof |
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| CN109371742B true CN109371742B (en) | 2021-05-14 |
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